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Eastern Dharwar Craton,India:Continental lithosphere growth by accretion of diverse plume and arc terranes

Geoscience Frontiers 2012年第3期3卷 225-240页

作者： C.Manikyamba Robert Kerrich National Geophysical Research Institute Council of Scientific and Industrial ResearchHyderabad 500 007India Department of Geological Sciences University of SaskatchewanSaskatoonSaskatchewan S7N 5E2Canada

Abstract Greenstone belts of the eastern Dharwar Craton, India are reinterpreted as composite tecto- nostratigraphic terranes of accreted plume-derived and convergent margin-derived magmatic sequences based on new high-precision elemental data. The former are dominated by a komatiite plus Mg-tholeiitic basalt volcanic association, with deep water siliciclastic and banded iron formation （BIF） sedimentary rocks. Plumes melted at 〈90 km under thin rifted continental lithosphere to preserve intrao- ceanic and continental margin aspects. Associated alkaline basalts record subduction-recycling of Me- soarchean oceanic crust, incubated in the asthenosphere, and erupted coevally with Mg basalts from a heterogeneous mantle plume. Together, komatiites-Mg basalts-alkaline basalts plot along the Phanero- zoic mantle array in Th/Yb versus Nb/Yb coordinate space, representing zoned plumes, establishing that these reservoirs were present in the Neoarchean mantle. Convergent margin magmatic associations are dominated by tholeiitic to calc-alkaline basalts compo- sitionally similar to recent intraoceanic arcs. As well, boninitic flows sourced in extremely depleted mantle are present, and the association of arc basalts with Mg-andesites-Nb enriched basalts-adakites documented from Cenozoic arcs characterized by subduction of young （〈20 Ma）, hot, oceanic litho- sphere. Consequently, Cenozoic style ＂hot＂ subduction was operating in the Neoarchean. These diverse volcanic associations were assembled to give composite terranes in a subduction-accretion orogen at -2.7 Ga, coevally with a global accretionary orogen at -2.7 Ga, and associated orogenic gold mineralization.

关键词： Continental lithospheregrowth Zoned plume subduction-accretion Neoarchean mantle Geodynamics Eastern Dharwar Craton

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Greenstone belts and their mineral endowment:Preface

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Geoscience Frontiers 2018年第3期9卷 599-601页

作者： Sohini Ganguly Qiong-Yan Yang Department of Earth Science Goa University School of Earth Sciences and Resources China University of Geosciences Beijing

The granite-greenstone terranes nested in Archean cratonic nuclei of continents over the world are composed of variably metamorphosed igneous and sedimentary remnants of ancient ocean *** rocks preserve distinct geolo... 详细信息

关键词： granite-greenstone subduction-accretion VMS

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Tectonic evolution of the western Kunlun orogenic belt,western China

Tectonic evolution of the western Kunlun orogenic belt,weste...

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中国科学院地质与地球物理研究所2004学术年会

作者： Wang Zhihong~* Laboratory of Lithosphere Tectonic Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

The western Kunlun orogenic belt in western China evolved through the development of a large subduction-accretionary complex, including flysch sediments and granitic plutons,and by collision of three terranes,namely the North and South Kunlun and Karakorum-Qiangtang blocks from the early Paleozoic to the early ***-dipping subduction of the Paleo-Tethys ocean beneath the Kunlun terranes,which may have commenced in the Cambrian,produced an early Paleozoic Andean-type magmatic arc on the South Kunlun,and a marginal back arc basin,represented by the early Paleozoic Oytag-Kudi ophiolite belt,between the North and South Kunlun.A northward subduction zone consumed the basin and the young,hot upper plate lithosphere was obducted southward onto the South Kunlun following closure of the *** resulted in collision of the North and South Kunlun in the early *** northward subduction of Paleo-Tethys resulted in the development of a Carboniferous-Triassic magmatic arc,and a back arc rifting sequence composed of the Carboniferous to Permian carbonates and clastic sediments on the North and South Kunlun *** Paleo-Tethys ocean finally closed in the late Triassic-early Jurassic,when the Kunlun and Karakorum-Qiangtang blocks were accreted,with the Kara-Kunlun accretionary prism marking their suture zone.

关键词： Ophiolite subduction-accretion Collision Back arc Western Kunlun

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Paleozoic tectonic evolution of the northern Xiajiang,China:Geochemical and geochronological constraints from the ophiolites

Paleozoic tectonic evolution of the northern Xiajiang,China:...

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中国科学院地质与地球物理研究所2003学术年会

作者： Zhihong Wang,Shu Sun,Jiliang Li,Quanlin Hou,Kezhang Qin,Wenjiao Xiao, and Jie Hao Laboratory of Lithosphere Tectonic Evolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing, People’s Republic of China.

[1]The northern Xinjiang of China is a composite orogenic belt in the south central part of the Altaids formed by subduction-accretion mainly during the *** and geochemical data from the Paleozoic ophiolites and assoc... 详细信息

关键词： northern Xinjiang Paleozoic ophiolite subduction-accretion Altaids.

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